Depends on design (flat base, boat tail, round nose, VLD) - I would say a 100 grain flat base spitzer would be fine (based on my 243 experience), a 100 grain boat tail is ok too depending on actual bullet/twist of your rifle/load, and you could go up to 115 or so in a round nose flat base. No way you could do the heavy VLD or a-max type with a 10 twist.
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